Pop-up blockers built into your browser stop most ads before they appear
Every major browser — Chrome, Firefox, Safari, and Edge — has a pop-up blocker turned on by default. This means most pop-ups never reach your screen. When a pop-up does get through, it is usually because a website you visited asked your permission to show notifications, or because the ad is disguised as part of the page itself.
The first step is to check whether your browser's blocker is actually on. In Chrome, go to Settings, then Privacy and Security, then Site Settings, then Pop-ups and redirects. Make sure "Blocked (recommended)" is selected. In Firefox, go to Settings, then Privacy & Security, scroll to Permissions, and confirm that "Block pop-up windows" is checked. Safari users can go to Safari menu, then Preferences, then Security, and check "Block pop-ups". In Edge, go to Settings, then Privacy, Search, and Services, then Site Permissions, then Pop-ups and redirects, and select "Block".
Key Takeaways
- Your browser's built-in pop-up blocker is on by default and stops the majority of pop-ups without any action from you.
- Notification permissions are a common way pop-ups get around blockers — you can revoke these permissions in your browser settings at any time.
- Browser extensions like uBlock Origin and Adblock Plus add an extra layer by blocking ads that slip past the default blocker.
- Some websites require you to disable your blocker to use them; you can allow pop-ups for just that one site instead of turning off protection everywhere.
- Pop-ups that look like system warnings or update prompts are usually fake — close them by pressing Escape or closing the tab, not by clicking inside the pop-up.
Turn off notification permissions that websites abuse
Websites often ask permission to send you notifications. Once you grant that permission, they can send pop-ups to your desktop or browser even when you are not visiting the site. Many sites use this feature to send ads disguised as urgent messages.
To see which sites have notification permission on your computer, open your browser settings and find the Notifications section. In Chrome, this is Settings > Privacy and Security > Site Settings > Notifications. In Firefox, it is Settings > Privacy & Security > Permissions > Notifications. You will see a list of every site that has asked for and received permission. Click the three dots or trash icon next to any site you do not trust, and select "Remove" or "Block". You can also change the default from "Ask" to "Block" so websites cannot ask for permission in the first place.
Install a browser extension for ads that slip through
Browser extensions add features to your browser. Some extensions specifically target ads and pop-ups that get past your browser's built-in blocker. The most widely used are uBlock Origin (free, open-source, and available for Chrome, Firefox, and Edge) and Adblock Plus (free, available for all major browsers). Both work by maintaining lists of known ad servers and blocking requests to those servers before they load.
To install uBlock Origin in Chrome, go to the Chrome Web Store, search for "uBlock Origin", and click "Add to Chrome". In Firefox, go to the Firefox Add-ons page, search for "uBlock Origin", and click "Add to Firefox". The extension runs in the background and requires no setup. If a website loads slowly or seems broken after you install an extension, you can temporarily disable it for just that site by clicking the extension icon in your address bar and toggling it off.
Be cautious about installing many extensions at once. Each one uses memory and can slow your browser. Two or three trusted extensions are usually enough; more than that often causes problems.
Allow pop-ups for one website without disabling protection everywhere
Some websites — particularly banking sites, email services, and document editors — use pop-ups for legitimate features like password reset windows or file uploads. Rather than turn off your blocker entirely, you can allow pop-ups for just that one site.
When a pop-up is blocked, your browser usually shows a small notification in the address bar or at the top of the page. Click that notification and select "Always allow pop-ups on this site" or similar wording. The exact phrasing varies by browser, but the option is always there. The next time you visit that site, pop-ups will load normally. Your blocker remains on for every other website.
Close fake pop-ups that pretend to be system warnings
Some pop-ups are designed to look like Windows or Mac system messages, telling you that your device has a virus or needs an update. These are almost always fake. Real system updates come through your operating system settings, not through a website.
If you see a pop-up claiming your device is infected or out of date, do not click anything inside it. Instead, press the Escape key on your keyboard, or close the entire browser tab by clicking the X. If the pop-up covers the entire screen and you cannot see the X, press Alt+F4 on Windows or Command+Q on Mac to close the browser window. Do not click "OK", "Update", or any button inside the pop-up, because these often read malware or take you to a scam website.
Recognize when a pop-up is actually part of the page
Not all pop-ups are blocked by pop-up blockers. Some websites build ads directly into the page layout — they appear as boxes or banners that look like pop-ups but are actually part of the HTML. Your browser's blocker cannot stop these because they are not technically pop-ups; they are just regular page elements.
These ads are harder to remove because they are not separate windows. Some browser extensions can hide them, but the most reliable method is to use a content blocker like uBlock Origin in "hard mode", where you can manually block specific elements on a page. To do this, click the uBlock Origin icon, then click the eyedropper tool, and click on the ad you want to hide. The extension will block that element and similar ones on future visits to the site.
Check your antivirus or security software settings
If you have installed antivirus software or a security suite on your computer, it may have its own pop-up blocker that conflicts with your browser's blocker. This rarely causes problems, but if pop-ups are still getting through after you have confirmed your browser blocker is on, check your security software settings.
Open your antivirus or security program and look for a section called "Web Protection", "Browsing Protection", or "Pop-up Blocker". Make sure it is turned on. If both your browser and your security software have blockers running, they usually work together without conflict. If you find that one is interfering with websites you trust, you can disable the security software's blocker and rely on your browser's instead.
Frequently Asked Questions
Why do some pop-ups still get through even though my blocker is on?
Pop-ups that appear after you click a link or button are often allowed through because your action triggered them. Websites also sometimes use notifications (which you may have granted permission for) or build ads directly into the page. Check your notification permissions and consider installing an extension like uBlock Origin for extra coverage.
Will disabling pop-ups break websites I use?
Most websites work fine with pop-ups blocked. If a site needs to show you a pop-up for a legitimate reason — like a password reset window — you will see a notification in your address bar. You can allow pop-ups for just that site without turning off protection everywhere else.
Is it safe to install ad-blocking extensions?
Extensions from official browser stores (Chrome Web Store, Firefox Add-ons, Microsoft Edge Add-ons) are reviewed before they are published. uBlock Origin and Adblock Plus are both widely used and open-source, meaning their code is publicly available for security researchers to review. Stick to extensions from official stores and avoid installing many at once.
What should I do if a pop-up says my device has a virus?
Close the pop-up when ready by pressing Escape or closing the tab. These are fake warnings designed to scare you into clicking. Real virus warnings come from your operating system or antivirus software, not from websites. Do not read anything or click any button inside the pop-up.
Can I block pop-ups on my phone or tablet?
Yes. Chrome on Android and Safari on iPhone both have pop-up blockers turned on by default. You can check by going to Settings > Apps > Chrome (or Safari) > Permissions, or by opening the browser and looking in its settings menu under Privacy or Site Settings. The process is similar to desktop browsers.